Stamp-tappet and securing means therefor.



No. 768,146. PATENTED JUNE 21 1904'. 0. BROWN & F. HAYES. STAMP TAPPETAND SECURING MEANS THEREFOR.

APPLICATION FILED DEC. 10. 1901.

N0 MODEL UNITED STATES Patented June 21, 1904.

PATENT OFFICE.

CLARENCE BhOlVN, OF BISHOP, AND FRANK HAYES, OF ELMONTE,

- CALIFORNIA.

STAMP-TAPPET AND SECURING MEANS THEREFOR.

SPECIFICATION forming part of Letters Patent No. 763,146, dated June 21,1904.

Application filed December 10, 1901. Serial No. 85,344. (No model.)

To all whom it may concern:

Be it known that we, CLARENCE BROWN, residing at Bishop, county of Inyo,and FRANK HAYES, residing at Elmonte, county of Los Angeles, State ofCalifornia, citizens of the United States, have invented an Improvementin Stamp-Tappets and Securing lWleans Therefor; and we hereby declarethe following to be a full, clear, and exact description of the same.

Our invention relates to improvements in tappets which are secured uponthe stampstems of ore-crushing mills and the like.

The invention consists of the parts and the construction and combinationof parts, which will be hereinafter described and claimed.

These tappets are adapted to be engaged by cams upon a revolving shaft,whereby the stamps are alternately lifted and dropped and at the sametime given a slight rotary movement. The constant striking of the camsupon the tappets to lift the heavy stamps soon loosens tappets ofordinary construction, causing annoyance and delay.

The object of our invention is to provide a tappet which may be quicklyplaced in position upon a stem and quickly removed therefromand which isprevented absolutely from slipping when once it has been secured on thestem.

Figure l is a part vertical section and part elevation of our invention.Fig. 2 is a plan of the same.

A represents a stamp-stem which has had a portion of its surface milled,as shown at 2. This milling need only extend on that portion of the stemwhich is to receive the tappet.

The tappet B consists of a cylindrical block having a central bore 3adapted to receive the stem A. On one side of the bore alongitudinally-extending chamber 4 is formed, in which a gib 5 isadapted to be inserted. This gib has its surface serrated, as at 6, andthese serrations correspond with the milling on the stamp-stem, so thatwhen the key has been suitably driven home it is absolutely impossiloleto move the tappet lengthwise of the stem. The inner wall 7 of thechamber is inclined outwardly from the lower end of the tappet.

A portion of the top of the tappet is cut away, as at 8, so as to offeran opening into the chamber A, through which the key 9 is inserted. Theportion 10 of the tappet remaining between the opening 8 and the stemforms a stop or shoulder against which one end of the gib abuts. Theother end of the gib is supported against'the lower end wall 11 of thechamber, so that when the gib is once in position against the stem it isheld firmly within the tappet and in turn supports the tappet. Theinclined wall 7 extends to a point below the bottom wall 11 to form arecess, and said wall 11 and a corresponding integral portion of the topof the tappet between said recess or boreform stops or shoulders, asshown, and the gib is of such thickness that it is capable of endwiseinsertion through the top recess of the tappet and adapted to enter saidchamber and occupying the space between said top and bottom stops, saidgib and a corresponding portion of the stem being serrated or notchedand adapted to interlock. The key is of a single-tapering form disposedlongitudinally of the stem and insertible through the top recess of thetappet and is adapted to lie between said inclined wall 7 and the backof the gib, and it has a continuous hearing at all points on the back ofthe gib and has its lower end or point adapted to enter said bottomrecess 12.

It is to be noted that when the tappet and gib are in position on thestem and the key has been inserted to lock the parts together a space 13is left in the bottom of each of the notches formed in the stem and gib,so that compensation is made for wear of the corresponding projectionsfitting these notches. Likewise the openings 8 and recess 12 are of suchdimensions that a space is left for the key at either end of the gib, sothat it may be driven in from time to time to take up any wear of theparts.

A tappet of this construction is rapidly placed in position upon a stem,is absolutely preventedfrom slipping when once secured in place, andless force is required to drive in the key than is usual with tappets ofordinary construction. Consequently these keys are not so likely to bebattered up, and it is but the work of a moment to remove the key,whereupon the gib slips out of engagement with the stem and the tappetis quickly removed.

It is obvious that the form of the indenta tions on the stem and gib maybe varied from the present showing without in any way departing from theprinciple of our invention.

Having thus described our invention, What we claim, and desire to secureby Letters Patent, is-

The combination with a stamp-stem, of a tappet having a central bore toreceive the stem and having, at one side of said bore, an innerlongitudinally-extending chamber with a bottom wall 11, the upper end ofthe tappet being recessed to communicate with said chamher and the innerwall of the chamber being inclined in the direction of the length of thetappet said inclined wall extending to a point below the bottom wall 11to form a recess, and said bottom wall and a corresponding integralportion of the top of the tappet between said recess and bore formingstops or shoulders; a gib of such thickness that it is capable of end-Wise insertion through the top recess of the tappet and adapted to entersaid chamber and occupy the space between said top and bottom stops,said gib and the corresponding portion of the stem being serrated andadapted to interlock; and a single tapering key disposed longitudinallyof the stem and insertible through the top recess of the tappet andadapted to lie between said inclined wall and the back of the gib, saidkey having a continuous bearing at all points on the back of the latter,and having its lower end or point to enter said bottom recess.

In witness whereof we have hereunto set our hands.

CLARENCE BROWN. FRANK HAYES.

Witnesses:

W. A. GHALFANT, THEO. H. WooDwoR'rH.

